Our buy side liquidity and the current amount of NBT in circulation (around 190k NBT) are completely misaligned. The auction won’t change that in the effect you suggest, since a large amount of the bids will be made using exactly these NBT.
Let’s not assume that any major part of the 200k of the auction will be visible as buy side liquidity in the client at any time. Every NBT used for a bid in the auction and which otherwise would have been hold is additional sell side pressure in mid term.
EDIT: Just for reference from the last auction motion:
Proceeds of auction: 185,014 NBT and 32 BTC for a total of 193,819 NBT value
If we assume a similar ratio then we need to get rid of the NBT, and burning is the tool for that.